Merge pull request #4 from balena-io-modules/replace-yarn-npm

Update dependencies and replace yarn with npm

.babelrc

@@ -1,3 +1,12 @@
 {
-  "presets": ["es2015"]
+  "presets": [
+    [
+      "@babel/preset-env",
+      {
+        "targets": {
+          "node": "8"
+        }
+      }
+    ]
+  ]
 }

README.md

@@ -45,13 +45,12 @@ and [fileutils.go](https://github.com/moby/moby/blob/v19.03.8/pkg/fileutils/file
 ### Compatibility
 
 `dockerignore` works with Node.js version 8 and above, on Linux, macOS and Windows.
-The code is compiled with [Babel](https://babeljs.io/docs/en/), currently targeting
-[ES2015](https://en.wikipedia.org/wiki/ECMAScript).
+The code is compiled with [Babel](https://babeljs.io/docs/en/).
 
 ## Install
 
 ```bash
-npm install --save @balena/dockerignore  # or yarn add @balena/dockerignore
+npm install --save @balena/dockerignore
 ```
 
 ## Usage
@@ -243,7 +242,7 @@ Returns `function(path)` the filter function.
 Contributions are always welcome!
 
 1. Fork this repository to your own GitHub account and then clone it to your local device.
-2. Install the dependencies: `yarn` or `npm install`
+2. Install the dependencies: `npm install`
 3. Add a test case (if applicable) and ensure it currently fails
 4. Add code to pass the test
 5. Make a pull request (additional tests will run on CI to ensure that your test case agrees with an actual `docker build`)

appveyor.yml

@@ -28,8 +28,8 @@ environment:
 install:
   - cmd: powershell Install-Product node $env:nodejs_version
   - sh: nvm install $nodejs_version
-  - yarn --version
-  - yarn install
+  - npm --version
+  - npm install
 
 test_script:
   - node --version